Kennedy, Leslie W
McGraw-Hill Ryerson, 1983
Buku Teks
Gans, Herbert J., author
The Free Press, 1982
Buku Teks
Abrahamson, Mark, author
Prentice-Hall, 1980
Buku Teks
Jan Lin; Christopher Mele
Routledge, 2005
Buku Teks
edited by Ronan Paddison
Sage Publications, 2001
Buku Referensi